Within 60 days of Hyper-V's RTM, the Exchange team will publish a detailed support statement for Hyper-V, and a TechNet article with best practices. I'm part of the Exchange Virtualization Working Group and will be helping to deliver some of this content.

Customers should not deploy Exchange on Hyper-V until our support guidance is available.

Early results show that performance of Exchange 2007 on Hyper-V is quite good, and that it scales very well from 1-4 processors per VM.

In terms of best practices and requirements, Brent shared the following: